Comment 6 for bug 973609

I'm not seeing anything stacking up in the network message queue, but I did find this in the nova-network.log:

2012-04-04 19:58:55 DEBUG nova.utils [-] Attempting to grab semaphore "iptables" for method "apply"... from (pid=5853) inner /usr/lib/python2.7/dist-packages/nova/utils.py:891
2012-04-04 19:58:55 DEBUG nova.network.linux_net [-] IPTablesManager.apply completed with success from (pid=5853) apply /usr/lib/python2.7/dist-packages/nova/network/linux_net.py:340
2012-04-04 19:58:55 ERROR nova.rpc.amqp [-] Exception during message handling
(nova.rpc.amqp): TRACE: Traceback (most recent call last):
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 252, in _process_data
(nova.rpc.amqp): TRACE: rval = node_func(context=ctxt, **node_args)
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 263, in wrapped
(nova.rpc.amqp): TRACE: return func(self, context, *args, **kwargs)
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 469, in associate_floating_ip
(nova.rpc.amqp): TRACE: fixed_address, interface)
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/manager.py", line 490, in _associate_floating_ip
(nova.rpc.amqp): TRACE: interface)
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/l3.py", line 99, in add_floating_ip
(nova.rpc.amqp): TRACE: linux_net.ensure_floating_forward(floating_ip, fixed_ip)
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/network/linux_net.py", line 507, in ensure_floating_forward
(nova.rpc.amqp): TRACE: iptables_manager.apply()
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/nova/utils.py", line 907, in inner
(nova.rpc.amqp): TRACE: retval = f(*args, **kwargs)
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/lockfile.py", line 230, in __exit__
(nova.rpc.amqp): TRACE: self.release()
(nova.rpc.amqp): TRACE: File "/usr/lib/python2.7/dist-packages/lockfile.py", line 273, in release
(nova.rpc.amqp): TRACE: raise NotMyLock
(nova.rpc.amqp): TRACE: NotMyLock
(nova.rpc.amqp): TRACE:
2012-04-04 19:58:55 ERROR nova.rpc.amqp [-] Returning exception to caller

I'll check the log to see if anything needs redacting and tar it up for you.